CN217418324U - Endogenous short-cut denitrification enhanced short-cut nitrification/anaerobic ammonia oxidation deep denitrification device - Google Patents
Endogenous short-cut denitrification enhanced short-cut nitrification/anaerobic ammonia oxidation deep denitrification device Download PDFInfo
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Abstract
The utility model discloses an endogenous short cut denitrification reinforces short cut nitrification/anaerobic ammonia oxidation degree of depth denitrification device belongs to sewage biological treatment technical field, including former water tank, anaerobic reaction pond, membrane bioreactor, short cut nitrification reaction pond, endogenous short cut denitrification coupling anaerobic ammonia oxidation reaction pond and two heavy ponds, provide key substrate NO for anaerobic ammonia oxidation jointly through short cut nitrification and endogenous short cut denitrification's advantage is complementary 2 ‑ Improving NO caused by anaerobic ammonium oxidation of municipal sewage in coping with short-cut nitrification instability 2 ‑ /NH 4 + Robustness to proportioning fluctuationsCoupling endogenous short-cut denitrification and anaerobic ammonia oxidation to realize byproduct NO 3 ‑ The utility model discloses can realize municipal sewage treatment's degree of depth denitrogenation and energy saving and consumption reduction, stability is strong, is applicable to newly-built sewage plant and old sewage plant's upgrading transformation.
Description
Technical Field
The utility model belongs to the technical field of sewage biological treatment, especially, relate to an endogenous short distance denitrification reinforces short distance nitration/anaerobic ammonia oxidation degree of depth denitrification device.
Background
The shortcut nitrification/anaerobic ammonia oxidation technology becomes a hot point in the field of sewage treatment because of realizing autotrophic nitrogen removal, and can save about 60 percent of aeration energy consumption and 100 percent of organic carbon source; meanwhile, the yield of the excess sludge can be reduced by about 80 percent. At present, the successful application of the urban sewage shortcut nitrification/anaerobic ammonia oxidation process is hindered by the difficulty in effectively inhibiting Nitrite Oxidizing Bacteria (NOB) under the condition of low temperature and low ammonia nitrogen concentration. Excessive growth of NOB often results in NO 2 - /NH 4 + Fluctuation of mixture ratio and accumulation of high-concentration by-product NO in effluent 3 - Further, the denitrification efficiency of the whole system is at a lower level (less than or equal to 70 percent). In addition, organic matters contained in the municipal sewage can cause heterotrophic bacteria and autotrophic anammox bacteria to compete for substrate NO 2 - Further affecting the stability of the mainstream anammox process.
Recent studies report that glycan-bacterium-driven endogenous short-range denitrification technology can provide stable key substrate NO for anaerobic ammonia oxidation 2 - . Under anaerobic conditions, the polysaccharide bacteria can absorb organic matters in the intake water and convert the organic matters into intracellular Polymers (PHAs); then under the anoxic condition, the glycan bacterium utilizes the stored PHAs as an electron donor to convert NO 3 - Reduction to NO 2 - . By coupling endogenous short-range denitrification and anaerobic ammonia oxidation, the denitrification performance of the whole system can be obviously improved. In this system, NO is produced due to instability of short-cut nitrification 3 - And NO produced as a by-product of the anammox reaction 3 - All can pass throughSource short-cut denitrification to NO 2 - Excess NO for further use in anammox 2 - Can also be denitrified into N 2 . Meanwhile, the system can realize the advantage complementation of the short-cut nitrification and the endogenous short-cut denitrification, and is used for anaerobic ammonia oxidation reaction in NO 2 - /NH 4 + Flexibility is provided on the demand of proportioning, and the stability of the system is improved. Therefore, compared with the traditional shortcut nitrification/anaerobic ammonia oxidation process, the endogenous shortcut denitrification enhanced municipal sewage shortcut nitrification/anaerobic ammonia oxidation deep denitrification technology deals with NO 2 - /NH 4 + Proportioning fluctuations and handling excess NO 3 - The method has unique advantages, can greatly improve the nitrogen removal rate and stability of the anaerobic ammonia oxidation process, and provides new ideas and technical supports for realizing energy conservation and consumption reduction of deep denitrification of municipal sewage treatment plants.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to urban sewage short cut nitrification/anaerobic ammonium oxidation be difficult to stably maintain and remain too high concentration NO in the play water 3 - The invention provides an endogenous short-cut denitrification reinforced short-cut nitrification/anaerobic ammonia oxidation deep denitrification device, and key substrate NO is provided for anaerobic ammonia oxidation through the complementary advantages of short-cut nitrification and endogenous short-cut denitrification 2 - Improving NO caused by anaerobic ammonia oxidation of municipal sewage in response to unstable shortcut nitrification 2 - /NH 4 + Robustness of the proportioning fluctuation; endogenous short-range denitrification and anaerobic ammonia oxidation are coupled to realize the byproduct NO 3 - The further removal of the nitrogen and the ammonia is realized, and the application bottleneck of stable operation of anaerobic ammonia oxidation and deep denitrification of the urban sewage is broken through.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides an endogenous short cut denitrification reinforces short cut nitrification/anaerobic ammonium oxidation degree of depth denitrification device, includes former water tank, former water tank export sends sewage to the anaerobic reaction pond through the intake pump, and anaerobic reaction pond delivery port department sets up membrane bioreactor, and membrane bioreactor delivery port passes through vacuum pump and short cut nitrification reaction pond UNICOM, and the anaerobic reaction pond mud export sends mud to endogenous short cut denitrification coupling anaerobic ammonium oxidation reaction pond through surmounting the sludge pump, the short cut nitrification reaction pond top is linked together through pipeline and endogenous short cut denitrification coupling anaerobic ammonium oxidation reaction pond, and endogenous short cut denitrification coupling anaerobic ammonium oxidation reaction pond passes through discharge conduit and two heavy ponds UNICOM, two heavy ponds are including being located the cylindrical barrel on upper portion and being located the toper portion of discharging of lower part, and cylindrical barrel inside is equipped with vertical discharge tube, the discharge tube extends downwards in the barrel and discharges the material portion top, discharge tube upper portion and endogenous short distance denitrification coupling anaerobic ammonium oxidation reaction tank's ejection of compact pipeline UNICOM, the discharge tube internal diameter is greater than the internal diameter of ejection of compact pipeline, the cylindrical barrel lateral part in two heavy ponds is equipped with the delivery port, be equipped with excess sludge discharge valve on the row of material pipe of toper discharge portion bottom, two heavy pond bottoms are linked together with anaerobic reaction tank through the backward flow sludge pump, the structural design in two heavy ponds can satisfy and get into behind the discharge tube because the buffer flow velocity slows down behind the pipe diameter grow from the mixture that contains the floccule that endogenous short distance denitrification coupling anaerobic ammonium oxidation reaction tank spills over, be favorable to flocculent sludge to the flocculent sludge to collect in toper discharge portion, reduce the overflow that the disturbance influences barrel top supernatant, play fine concerted action to the water purification of whole system.
Furthermore, stirring components are arranged in the anaerobic reaction tank and the inner source short-cut denitrification coupling anaerobic ammonia oxidation reaction tank, an aeration component is arranged at the bottom of the short-cut nitrification reaction tank, and the aeration component comprises an air blower and an aeration head.
Furthermore, a suspension filler is arranged in the short-cut nitrification reaction tank, and the specific surface area of the suspension filler is 250-750 m 2 /m 3 The filling ratio is 25-45%; the anaerobic ammonia oxidation reaction tank is characterized in that a fixing filler is arranged in the endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank and sleeved on fixing rods, the fixing rods are uniformly distributed at the bottom of the endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank, and the specific surface area of the fixing filler is 250-750 m 2 /m 3 The filling ratio is 25-45%.
The utility model has the advantages that:
1. the device can obviously reduce the energy consumption and cost of urban sewage treatment, and can realize deep denitrification of anaerobic ammonia oxidation technology, and the theoretical denitrification efficiency can reach 100%;
2. the device improves the system response NO through the synergistic effect of the short-cut nitrification, the endogenous short-cut denitrification and the anaerobic ammonia oxidation 2 - /NH 4 + Stability of proportioning fluctuation and realization of by-product NO 3 - Removing the depth of the substrate;
3. a membrane bioreactor is arranged at the tail end of the anaerobic tank for sludge-water separation, and the shortcut nitrification tank adopts a suspended biological filler form, so that the shortcut nitrification process is independently controlled, and the operation and maintenance are simple;
4. endogenous short-range denitrifying bacteria grow in floc sludge, anaerobic ammonium oxidation bacteria are attached to fixed biological fillers, and the synergistic coexistence of the endogenous short-range denitrifying bacteria and the anaerobic ammonium oxidation bacteria in the system can be maintained in a mode of periodically discharging part of the floc sludge, so that the running stability of the anaerobic ammonium oxidation process of the municipal sewage is improved;
5. the structural design of two heavy ponds can satisfy and get into the discharge tube back because the buffer flow velocity slows down after the pipe diameter grow from the mixture that contains the floccule that endogenous short-cut denitrification coupling anaerobic ammonium oxidation reaction tank spilled over, is favorable to flocculent mud to collect in toper row material portion, reduces the overflow that the disturbance influences barrel top supernatant, plays fine coordinated action to the water purification of whole system.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in fig. 1, an endogenous short-cut denitrification enhanced short-cut nitrification/anaerobic ammonia oxidation deep denitrification device comprises a municipal sewage raw water tank 1, a water inlet pump 2, an anaerobic reaction tank 3, a stirring component 4, a membrane bioreactor 5, a vacuum pump 6, a short-cut nitrification reaction tank 7, a suspended filler 8, an aeration head 9, an aeration component 10, an over-running sludge pump 11, an endogenous short-cut denitrification coupled anaerobic ammonia oxidation reaction tank 12, a fixed filler 14, a secondary sedimentation tank 15, a water outlet 16, a return sludge pump 17 and a residual sludge discharge valve 18; the urban sewage raw water tank 1 is connected with an anaerobic reaction tank 3 through a water inlet pump 2, the anaerobic reaction tank 3 is connected with an endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank 12 through an overrunning sludge pump 11, the anaerobic reaction tank 3 is provided with a stirring component 4, the stirring component comprises a stirring shaft, a driving motor and stirring blades, the stirring component is fixed in the anaerobic reaction tank through a fixing frame, a membrane bioreactor 5 is placed at the tail end of the anaerobic reaction tank, namely a water outlet, the membrane bioreactor 5 is connected with a short-cut nitrification reaction tank 7 through a vacuum pump 6, suspended fillers 8 are filled in the short-cut nitrification reaction tank 7, and an aeration component 10 is arranged at the bottom of the short-cut nitrification reaction tank through an aeration head 9 and provides dissolved oxygen for the short-cut nitrification reaction tank; the shortcut nitrification reaction tank 7 is connected with an endogenous shortcut denitrification coupling anaerobic ammonia oxidation reaction tank 12 through a connecting pipeline at the top of the shortcut nitrification reaction tank, fixed fillers 14 are filled in the endogenous shortcut denitrification coupling anaerobic ammonia oxidation reaction tank 12 and are sleeved on fixed rods, the fixed rods are uniformly and vertically distributed at the bottom of the endogenous shortcut denitrification coupling anaerobic ammonia oxidation reaction tank, and a stirring assembly 4 is also arranged in the endogenous shortcut denitrification coupling anaerobic ammonia oxidation reaction tank; the inner source short-range denitrification coupling anaerobic ammonia oxidation reaction tank 12 is connected with a secondary sedimentation tank 15 through a discharge pipeline, the secondary sedimentation tank 15 comprises a cylindrical barrel body positioned on the upper part and a conical discharge part positioned on the lower part, a vertical discharge pipe is arranged in the cylindrical barrel body, the discharge pipe extends downwards in the barrel body to the upper part of the conical discharge part, the upper part of the discharge pipe is communicated with the discharge pipeline of the inner source short-range denitrification coupling anaerobic ammonia oxidation reaction tank 12, the inner diameter of the discharge pipe is larger than that of the discharge pipeline, the side part of the cylindrical barrel body of the secondary sedimentation tank 15 is provided with a water outlet 16, a residual sludge discharge valve 18 is arranged on the discharge pipe at the bottom of the conical discharge part, the bottom of the secondary sedimentation tank 15 is communicated with the anaerobic reaction tank 3 through a return sludge pump 17, and the structural design of the secondary sedimentation tank can meet the requirement that the buffer flow rate becomes slow after a mixture containing floccules overflowing from the inner source short-range denitrification coupling anaerobic ammonia oxidation reaction tank enters the discharge pipe due to the enlargement of the pipe diameter, the flocculation sludge is favorably collected in the conical discharge part, the disturbance influence on the overflow of the supernatant on the top of the cylinder is reduced, and a good coordination effect is realized on the water purification of the whole system.
The treatment process of the urban sewage in the process comprises the following steps: the urban sewage firstly enters an anaerobic reaction tank, and simultaneously enters return sludge of a secondary sedimentation tank, and organic matters in the sewage are removed and stored as internal carbon Sources (PHAs) by using glycan bacteria in the sludge; then sludge-water separation is carried out by a membrane bioreactor, sewage containing ammonia nitrogen enters a short-cut nitrification reactor, ammonia oxidizing bacteria attached to and growing on the suspended filler react NH 4 + Oxidation to NO 2 - Inevitably, there will be a small amount of nitrite-oxidizing bacteria present, which will partially oxidize NO 2 - Oxidation to NO 3 - (ii) a Then containing NO 2 - And NO 3 - The sewage enters an endogenous short-range denitrification coupling anaerobic ammonia oxidation reaction tank, the sewage also enters surpassing sludge of the anaerobic reaction tank, and NO is converted into NO by anaerobic ammonia oxidizing bacteria attached and grown on fixed fillers 2 - And NH carried over by sludge 4 + Conversion to N 2 And a small amount of by-product NO 3 - Glycan bacteria in the floc sludge provide electron donors by degrading endoprobe-derived PHAs (phenylalanine-like amino acids), and NO is generated by nitrite oxidizing bacteria and anaerobic ammonium oxidizing bacteria 3 - Reduction to NO 2 - Further utilization of excess NO by anammox reactions 2 - Can also be denitrified into N 2 (ii) a And (4) the mixed liquid after deep denitrification enters a secondary sedimentation tank, and after mud-water separation, the supernatant is discharged from a water outlet.
The specific test water is taken from domestic sewage of a certain community, and the water quality is as follows: the COD concentration is 130-280 mg/L; NH (NH) 4 + The concentration of-N is about 60mg/L, NO 2 - -N≤0.5mg/L，NO 3 - N is less than or equal to 0.5mg/L, and P is 5-10 mg/L. The test system is shown in FIG. 1.
The specific operation is as follows:
1) starting the system: inoculating the sludge with the endogenous short-cut denitrification performance into the anaerobic reaction tank 3 and the endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank 12, and enabling the sludge concentration MLSS to be =3000 mg/L; meanwhile, the anaerobic ammonia oxidation reaction tank 12 is added with the suspended anaerobic ammonia oxidation reactionThe fixed filler 14 of the material film, the filling ratio is 25%; adding the suspended filler 8 with the hung ammonia oxidation biological membrane into a short-cut nitrification reaction tank 7, wherein the filling ratio is 35%; the specific surface areas of the suspended filler 8 and the fixed filler 14 are both 600m 2 /m 3 The density was 0.98 g/cm.
2) Urban sewage in the urban sewage raw water tank 1 enters an anaerobic reaction tank 3 through a water inlet pump 2, simultaneously sludge at the bottom of a secondary sedimentation tank 15 enters the anaerobic reaction tank 3 through a return sludge pump, and the hydraulic retention time of the anaerobic reaction tank 3 is controlled to be 1.5 h; in the anaerobic reaction tank 3, the organic matters in the inlet water are absorbed by the glycan bacteria, and an internal carbon source PHAs is synthesized;
3) 60 percent of mixed liquor in the anaerobic reaction tank 3 enters a membrane bioreactor 5 to realize sludge-water separation, and the mixed liquor contains NH 4 + The sewage enters a short-cut nitrification reaction tank 7 through a vacuum pump 6; 40 percent of bottom sludge enters an endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank 12 through a surpassing sludge pump 11;
4) dissolved oxygen is provided for the short-cut nitrification reaction tank 7 through the aeration component 7 and the aeration head 9, and the concentration of the dissolved oxygen is controlled to be 1 mg/L; controlling the hydraulic retention time of the short-distance nitration reaction tank 7 to be 3 h, enabling ammonia oxidizing bacteria to grow on the suspended filler 8, and reacting NH 4 + Oxidation to NO 2 - (ii) a Inevitably, a small amount of nitrite-oxidizing bacteria exists, and part of NO is removed 2 - Oxidation to NO 3 - (ii) a Then containing NO 2 - And NO 3 - The sewage enters an endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank 12;
5) controlling the hydraulic retention time of the endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank 12 to be 4 h, so that anaerobic ammonia oxidizing bacteria grow on the filler, and the loss of the anaerobic ammonia oxidizing bacteria is avoided; anaerobic ammonium oxidation bacteria to convert NO 2 - And NH carried over by sludge 4 + Conversion to N 2 And a small amount of by-product NO 3 - (ii) a On the other hand, glycan bacteria in the floc sludge provide electron donors by degrading endoprobe PHAs (phosphate synthase) to generate NO (nitric oxide) by nitrite oxidizing bacteria and anaerobic ammonium oxidizing bacteria 3 - Reduction to NO 2 - Further utilization of excess NO by anammox reactions 2 - Can also be denitrified into N 2 And the mixed liquid after deep denitrification enters a secondary sedimentation tank 15.
6) Sludge-water separation is realized by controlling the hydraulic retention time to be 2 hours in the secondary sedimentation tank 15, bottom sludge flows back to the anaerobic reaction tank 3 through a return sludge pump, the reflux ratio is 200 percent, the alternate operation of floc sludge under anaerobic and anoxic conditions is maintained, and the normal work of polysaccharide bacteria is ensured; the treated supernatant is discharged through the water outlet 16.
7) Part of residual sludge is periodically discharged from the bottom of the secondary sedimentation tank 15 through a sludge discharge valve 18, so that the concentration of floc sludge in the system is maintained at 3000mg/L, and the sludge age is controlled at 12 d.
The test result shows that: after the operation is stable, the COD of the effluent of the system is 30-50mg/L and NH 4 + -N is about 1.5mg/L, NO 3 - -N is about 1mg/L, NO 2 - the-N is about 0.5mg/L, and the total nitrogen removal rate is about 95 percent.
The utility model discloses a but device of endogenous short distance denitrification strengthening municipal sewage short distance nitrification/anaerobic ammonia oxidation degree of depth denitrogenation wide application in municipal sewage's economic high-efficient denitrogenation is handled.
Claims (3)
1. An endogenous short-cut denitrification enhanced short-cut nitrification/anaerobic ammonia oxidation deep denitrification device is characterized in that: the device comprises a raw water tank, wherein the outlet of the raw water tank delivers sewage to an anaerobic reaction tank through a water inlet pump, a membrane bioreactor is arranged at the water outlet of the anaerobic reaction tank, the water outlet of the membrane bioreactor is communicated with a short-cut nitrification reaction tank through a vacuum pump, the sludge outlet of the anaerobic reaction tank delivers sludge to an endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank through an overrunning sludge pump, the top of the short-cut nitrification reaction tank is communicated with the endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank through a pipeline, the endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank is communicated with a secondary sedimentation tank through a discharge pipeline, the secondary sedimentation tank comprises a cylindrical barrel body positioned at the upper part and a conical discharge part positioned at the lower part, a vertical discharge pipe is arranged inside the cylindrical barrel body, the discharge pipe extends downwards to the upper part of the conical discharge part in the barrel body, and the upper part of the discharge pipe is communicated with the discharge pipeline of the endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank, the inner diameter of the discharge pipe is larger than that of the discharge pipeline, the side part of the cylindrical barrel of the secondary sedimentation tank is provided with a water outlet, a residual sludge discharge valve is arranged on the discharge pipe at the bottom of the conical discharge part, and the bottom of the secondary sedimentation tank is communicated with the anaerobic reaction tank through a reflux sludge pump.
2. The endogenous short-cut denitrification enhanced short-cut nitrification/anammox advanced denitrification device of claim 1, wherein: the anaerobic reaction tank and the endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank are both provided with stirring assemblies, the bottom of the short-cut nitrification reaction tank is provided with an aeration assembly, and the aeration assembly comprises an air blower and an aeration head.
3. The endogenous short-cut denitrification enhanced short-cut nitrification/anaerobic ammonia oxidation advanced nitrogen removal device of claim 2, wherein: the short-cut nitrification reaction tank is internally provided with a suspended filler, and the specific surface area of the suspended filler is 250-750 m 2 /m 3 The filling ratio is 25-45%; the method is characterized in that a fixing filler is arranged in the endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank and sleeved on fixing rods, the fixing rods are uniformly distributed at the bottom of the endogenous short-cut denitrification coupling anaerobic ammonia oxidation reaction tank, and the specific surface area of the fixing filler is 250-750 m 2 /m 3 The filling ratio is 25-45%.
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